If you create your own bitcoin address and save the private & public address (eg write on paper and store on USB stick), then you can send your MAIDSAFEcoin to the public address and they will remain safe. Called a paper wallet.
Then use www.omniwallet.org only when you need to send them somewhere. By importing the addresses into a omniwallet online wallet.
Ensure you are virus free, or use off line computer, when you generate the bitcoin address. You can use bitaddress.org to generate an address.
To send MAIDSAFEcoin from a wallet you need some BTC as well for fees.